Asda is recalling all corned beef from its budget range after traces of veterinary drug phenylbutazone were found in some batches.
The Food Standards Agency said "very low levels" of the painkilling medicine, known as bute, were detected in the Asda Smart Price Corned Beef.
Customers who have bought the 340g tins, with any date code, have been urged not to eat the corned beef but to return it to the supermarket.
Asda withdrew the product on March 8 after it was found to contain more than 1% horse DNA. Bute was detected in some samples, at the level of four parts per billion (4ppb), when further tests were carried out.
In a statement on the Asda website, the supermarket said it was also recalling tins of Chosen By You corned beef. "The tinned Chosen By You Corned Beef (340g) product, also withdrawn in March, has not tested positive for phenylbutazone," the statement read. However as a precaution it is also being recalled as it is made in the same factory."